A woman accused of performing a sex act during a crowded BBC Radio 2 Concert in Hyde Park said that she was "tipsy and merry" at the time but did nothing wrong.
Lisanne Beck, 47, told the Old Bailey she was about a five on a one-to-ten scale of drunkenness.
She told the court: "I was not extremely drunk, I was happy."
She insists that the incident, in which onlookers claimed she performed oral sex on her boyfriend, Simon Murphy, was just her trying to help him to the toilet.
Ms Beck told the jury: "I shook him because I wanted to wake him up and to try and assist him to the toilet."
"He had not been to the toilet and I knew that he gets discomfort in his stomach because of a medical condition - IBS (irritable bowel syndrome)."
Concertgoers complained after seeing Beck and Murphy together during a set by Paloma Faith in September last year.
The couple were filmed on a mobile phone by one concert-goer who said he was "shocked" by what he saw, the jury has heard.
The court heard that the couple had each had around three or four cans of cider before arriving at the Radio 2 Live in Hyde Park concert on 14 September last year. Beck said she had also drunk from a pre-mixed bottle of vodka and coke.
The concert attracted TV audiences of 1.2 million people, and featured performances from Blondie, Paloma Faith and Billy Ocean.
Beck said that Murphy seemed normal and "just happy" when they were at the event.
She said that later she could not move him, as he was lying on the ground and was a "dead weight".
The next thing she recalls was security coming to throw the couple out of the event after being alterted by complaints.
Both Beck and Murphy deny a charge of outraging public decency, and have pleaded not guilty to behaving indecently by engaging in sexual activity including oral sex.Reuse content